Internal-combustion engine



` Feb. 16, 1926.

w. F. GEDnEs INTERNAL conusnou snows Filed Oct. 23, 1924 Patented Feb.ld, 1926..

UNEE) HQE..

WILLIAM FRANCS GEDBES, 0F SUBEAC, VJESTERN ATRALA, AUSTRALA, AS-

SIGNOR 0F THEEEEIGHTHS TO WALTER SGHGFELID, @E BASSENDEAN, YVESTERNAUSTRALIA.

NTERNALCGMBUSTEEI ENGNE.

Application :filed October 23, i924. Serial No. 745,350.

To all whom it may concern.'

Be it known that l, lViLLri-irr lFnANois Gnomes, a subject oil the King`ot Great Britain and ireland, and resident ot Subiaco, in the State ofWestern Australia, Commonwealth of Australia, have invented an lnrprovenient in lnternal-Combustion Engines, of which the followingdescription, in connection with the accompanying drawing, is aspecilication, like characters on the drawing representing like parts.

rilhis invention relates to improvements concerning internal combustionengines.

ln internal combustion engines, hitherto constructed, connecting rodshave been connected to cranks operating a crank shaft. rlhereiore, witha uniform speed of crank shaft, each stroke of the piston has had thesame velocity. it is considered that the comparatively low eliiciency otthe internal combustion engine is largely due to too rapid pistonvelocity during the power stroke, which precludes adequate absorption ofthe explosive effort.

The varying torque due to the changing positions oi' the connecting rodsand cranks also reduces the eiliciency.

The present invention discloses means whereby the explosion and intakepiston strokes can be ot comparatively slow speed, whilst the scavengingand compression strokes will be ot higher speed.

To enable the invention to be more readily understood reiierence willnow be made to the accompanying drawings, in which Fig. 1 is a sideelevation partly sectional ot a unit constructed according to theinvention.

Fig. 2 is a diagrammatic representation to indicate positions of thecrank and connecting rod at various parts of the up and down strokes.

Referring more specifically to Fig. 1, the piston 10 can have a gudgeonpin 11 ot' the conventional form. A. connecting rod 12 at the big end ispivoted and ulcrumed to a lug 18 of a rocking and slotted inclined bentlever 14. This lever is inclined upwardly so as to be at an angle of 150when the piston is at the top of the stroke and to be approximatelyhorizontal when the piston is at the bottom of the stroke. Such leverextends laterally and is ulcrumed at 15. rl`he crank shaft 16 isapproximately in horizontal alignment with the ulcrum 15 when theinvention is applied to a. vertical engine.V Said crank shaft has acrank 17 supporting a crank pin 18, that is embraced by a shroudedroller 19 running in the slot ot the lever 14.-. itlternfu'ivcly, asliding block could be used.

lleciprocation ot the connecting rod 12 results in the slotted lever 14ebeing rocked and in the roller 19 being rolled backwards and forwards inthe slot thereof. lllieanwhile the crank pin 18 is being rotated in thepath ci the dotted line shown in 1, whereby the crank shaft 16 carryingthe ily wheel is also rotated. Relative movement between the piston andthe crank shalt does not have the simple relationship that it does inthe conventional mechanism. This statement will be explained byreference to the diagrammatic representation shown in Fig. 2. in this a,o represent respectively the centres of the gudgeon pin and the crankpin when the piston is at the starting point ior the downward stroke; b,b represent the aforesaid centres when the piston has travelled halt' otits downward stroke; o, o represent the aforesaid centres when thepiston is at the end of the downward stroke; al', CZ represent theaforesaid centres when the piston has travelled halt of the returnstroke. This means that whilst the gudgeon pin and attached piston havetravelled from o to o, the crank pin has travelled from a to o', orabout 5/8 of a revolution. `Whilst the gudgeon pin and piston aretravelling the return stroke from o to o, the crank pin will travel fromc to o, or about '0X3 of a revolution.

rlranslated into terms of practice where there is a comparativelyconstant speed at the crank shaft the foregoing means that each pistonstroke is relatively ot slow speed, whilst the return stroke iscorrespondingly faster.

The invention as applied to a four cycle engine results in the explosionand intake strokes, being comparatively slow, whilst the scavenging andcompression strokes are correspondingly faster. lt should be noted thatthe lever 14 is ulcrumed laterally to the lett side ot the cylinder toobtain the e'ect peculiar to my invention when the crank rotates in aclockwise direction. Should it be necessary to apply my invention to anengine in which the crank normally rotates in an anti-clockwisedirection, then the lever le will be ulcrumed laterally to the right ofthe cylinder.

lt should further be noted that should the engine be inverted ascompared to the position which is conventional, the following relativepositions will be necessary. The power stroke will move upwardly, Whilstthe bent lever la will be inclined downwardly and will be ulcrumed tothe right of the cylinder to 'obtain the results accruing from thisinvention when the crankis rotating in a clockwise direction. Usually itwill be preferable to have a plurality o1 units operating the same crankshaft. The units will be positioned in such relative stroke positions asare adapted to give a well balanced power plant.

I claim 1. In an internal combustion engine, the combination of acylinder, a piston working therein, a connecting rod, a slotted rockinglever itulcrumed laterally lett of the cylinder and pivoted-to theconnecting rod, and a crank slidingly-connected to the slotted lever androtated in a clockwise direction thereby.

2. In an internal combustion engine, the combination ot a cylinder, apiston Working therein, a connecting rod, a slotted upwardly inclinedand bent rocking lever ulcrumed laterally lett of the cylinder andpivoted to the connecting rod, and a crank slldingly connected to theslotted lever and rotated in a clockwise direction thereby.

3. In an internal combustion engine, the combination of a slottedupwardly inclined and bent lever 'ulcrumed on the lett side, a crankslidingly connected to the slotted lever and rotated ina clockwisedirection thereby, and a crank shaft approximately in horizontalalignment with the itulcrum of the inclined lever.

l. In an internal combustion engine, the combination with a cylinder, ota piston working therein, a connecting rod, a crank shait having a crankand a slotted rocking lever fulcruined laterally of the cylinder at sucha point that a line drawn through the tulcrum and the crank shaft isapproximately perpendicular to the cylinder axis, the slotted portion ofsaid lever receiving the crank and being inclined relative to thecylinder axis, the ulcrum point and inclination oi' the lever being suchthat duringl the power stroke and suction stroke the c 'ank' will beturned through a greater arc than during the compression stroke andscavenging stroke.

Dated this 18th day of September, 1924.

l/VILLIAM FRANCIS GEDDES.

